From: "Giovanni Ceglia" <giovanniceglia AT inwind DOT it>
Newsgroups: comp.os.msdos.djgpp
Subject: problem with asm
Date: Mon, 18 Jun 2001 09:31:49 +0200
Organization: Wind Telecomunicazioni S.p.A.
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Hello all, i write because i ' ve some problems with mingw/cygwin and DevC++
compilers.

I operate with IDE tool called Dev C++, i 'm tring to do som graphic
function, but i encountered a lot of problems, i never had with others
compiler.

I ' tryed to write my function in assembler, but i don't know why, the
system go in crash, when i run it.

The function is very simple, it call BIOS interrupt 10h

what i must do is that:

   AX=13h
   INT 10h

With Intel Assembly i can do it with:

  mov ax,013h
  int 10h

With Assembley used by DevC++/Mingw/CygWin i tried that:

void vga( )
{
  __asm__("
     movb $0x00,%ah /n
     movb $0x13,&al /n
     int $0x10 /n
    ");
}

The system compile, but program go in irreversible crash on Windows 95 ( I
have Win 95 installed ).

So i tried also:

void vga( )
{
  asm (".byte 184,19,0,205,16");
}

The system compile, but program go in a reversible crash, but however is
crash.

I studyed a lot the problem and i discovered who could be possible resolve
this my problem with a complete C sintax with the library "dmpi.h".

void vga()
{
   __dpmi_regs rg;
   rg.x.ax = 0x13;
   __dpmi_int(0x10, &rg);
}

void txt()
{
   __dpmi_regs rg;
   rg.x.ax = 0x03;
   __dpmi_int(0x10, &rg);
}

I searched for this lib into system libraries directory but i didn't found
it!

So my question is, how can i realize with DevC++/Mingw/Cygwin compiler
operation  AX=13h and Int 10h?

Where can i found dmpi.h library?

Is it possible to do the same things with system libraries?


Thanks if anyone can tell me about this problems.




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